Although teaching games for understanding has been increasingly incorporated into physical education curricula around the world, many physical education teachers find it challenging to provide students with learning opportunities that foster critical thinking. Specifically, teachers have difficulty identifying problems in and potential solutions for students' performance during game play. To aid them, this article provides frameworks for diagnosing student performance problems in striking/fielding and target games and a sample lesson on how to implement the problem-diagnosis frameworks during instruction. (Contains 1 table and 2 figures.)